/Engine/Source/Runtime/GeometryCore/Public/DynamicMesh/DynamicMeshAttributeSet.h
These functions are called by theFDynamicMesh3to update the various attributes when the parent mesh topology has been modified. TODO: would it be better to register all the overlays and attributes with the base set and not overload these? maybe!
virtual void OnNewTriangle ( int TriangleID, bool bInserted )